Garmin Astro 220 changing language

Hello.
I was looking a solution to modify language in Garmin Astro 220, but didn't find it.
When I connect my Astro 320 to the computer I can explore the memory of the device. There is a folder Texts, and I need only to put the file Polish.gpt into this folder. How to do it on Astro 220? It does not show on computer as a usb memory and I can't explore it.
Anyone did similar thing and know how to do it?

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